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Pennsylvania
Bureau of Air Quality

Ozone Transport

Ozone Transport and NOx Information

Ground-level ozone air pollution is a serious and persistent national public health threat. Ozone and nitrogen oxides (NOx), a primary pollutant that helps form ozone, drift into Pennsylvania from areas to the west and south of the Commonwealth. Therefore, air crossing Pennsylvania’s borders is often already unhealthy - above federal health-based standards. The following information describes how Pennsylvania has been addressing this issue.

Animated Maps

See how ozone pollution was transported from areas outside of Pennsylvania by viewing EPA's AIRNOW animated maps.

Ozone Transport Commission

The 1990 Clean Air Act Ammendments established the Ozone Transport Commission (OTC) to coordinate the development of control plans for ground-level ozone in the Northeast and Mid-Atlantic Region. The OTC developed a NOx Memorandum of Understanding that Pennsylvania signed, leading to regulations that reduced NOx emissions by 55 to 65 percent from 1990 levels. This program will be replaced in 2003 by the NOx Budget Program contained in Chapter 145 (see below).

Recent Proposals

new Final 2010-2013 Annual and Ozone Season CAIR Nitrogen Oxides (Nox) Allowance Allocations
The Pennsylvania Department of Environmental Protection (DEP) is providing notice of the finalization of the 2010-2013 annual and ozone season CAIR NOx allowance allocations. On December 10, 2009, the U.S. Environmental Protection Agency (EPA) adopted a final rule approving the Pennsylvania CAIR State Implementation Plan (SIP) revision. (74 FR 65446, Dec. 10, 2009). Therefore, these allocations replace those under the EPA’s Federal Implementation Plan.

Questions concerning this notice should be directed to Mr. Randy Bordner, Chief, Stationary Source Section, Bureau of Air Quality at (717) 772-3921 or to ranbordner@state.pa.us.

Proposed 2010-2013 Annual and Ozone Season CAIR Nitrogen Oxides (NOx) Allowance Allocations

DEP is providing notice and an opportunity to comment on the proposed 2010-2013 annual and ozone season CAIR NOx allowance allocations during the required 15-day public comment period. The notice of the final annual and ozone season CAIR NOx allowance allocations will not be published in the Pennsylvania Bulletin until EPA adopts a final rule approving the Pennsylvania CAIR SIP revision. Written comments on the proposed annual and ozone season CAIR NOx allowance allocations should be sent to the attention of Mr. Randy Bordner, Environmental Group Manager, Air Resource Management Division, Bureau of Air Quality, DEP, P.O. Box 8468, Harrisburg, PA 17105-8468 or by e-mail to ranbordner@state.pa.us no later than November 2, 2009. Any written comments (including e-mails) should include the name, affiliation (if any), mailing address and telephone number of the interested person and contain “Proposed 2010-2013 Annual and Ozone Season CAIR Nitrogen Oxides (NOx) Allowance Allocations” in the subject line.

Measures Under Consideration by the Ozone Transport Commission

The Department of Environmental Protection (DEP) is seeking comments on potential control measures under consideration by the Ozone Transport Commission (OTC). DEP has scheduled three public meetings in August 2009 to present an overview of the federal Clean Air Act (CAA) requirements, the need for Pennsylvania to adopt additional measures for the achievement and maintenance of the ozone and fine particulate standards, and the potential control measures under consideration by the OTC. The Department of Environmental Protection (DEP) will also be accepting public comments until August 14. The OTC is a multi-state organization created under the Clean Air Act that is responsible for advising the U.S. Environmental Protection Agency (EPA) on pollution transport issues and for developing and implementing regional solutions to the ground-level ozone problem in the Northeast and Mid-Atlantic regions. The Commonwealth is a member of the OTC.

 

Section 126 Information

The OTAG process demonstrated that states to Pennsylvania’s west and south contribute significantly to violations of the ozone standard in the Commonwealth and throughout the northeast. Under Section 126 of the Clean Air Act, Pennsylvania petitioned the Environmental Protection Agency (EPA) to establish emission limitations on groups of sources necessary to achieve and maintain the ozone standard in Pennsylvania.

Section 110 Information

EPA issued final regulations under Section 110 of the Clean Air Act to require 22 eastern states with ozone problems to substantially reduce NOx emissions that are the primary cause of transported ozone. This is known as the Section 110 NOx SIP Call (State Implementation Plan). In other words, affected states are to develop a plan to reduce total summertime emissions of nitrogen oxides by 28 percent beginning in the year 2003.

NOx Budget Program, Chapter 145, Subchapter A

Pennsylvania's NOx reduction program was adopted in 1994, and the second phase of the program, including emissions trading, was implemented in 1999. Resulting emissions of NOx from affected sources in 1999 were reduced 60 percent from 1990 levels. Pennsylvania's Chapter 145 regulations, the answer to EPA's Section 110 NOx SIP Call, will improve on the market-based trading program starting in 2003.

Subchapter B, C

Phase II of the NOx SIP Call requires states to control emissions from cement kilns and large internal combustion engines by May 1, 2005. Pennsylvania adopted regulations to meet these requirements contained under Subchapter B and C to Chapter 145 on December 11, 2004.

Pennsylvania Bulletin
Frequently Asked Questions
Compliance Assessment Procedures

 

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